Carbon-based composite iron cyanamide material and preparation method thereof, and sodium ion battery adopting carbon-based composite iron cyanamide material as negative electrode material

A composite ferric cyanamide and carbon-based technology, which is applied in the field of electrochemical materials, can solve the problems of limited material application and difficulty in obtaining composite structures, and achieve uniform shape distribution, improved electrical conductivity and cycle reversibility, and large growth opportunities Effect

Active Publication Date: 2019-05-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Carbodiimide transition metal salts (MNCN, M is a transition metal) are a class of anode materials for sodium-ion batteries with high charge-discharge capacity potential, but it is difficult to obtain the material directly, and it is even more difficult to obtain the composite structure of the material, so it is remarkable Limit the application of this material

Method used

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  • Carbon-based composite iron cyanamide material and preparation method thereof, and sodium ion battery adopting carbon-based composite iron cyanamide material as negative electrode material
  • Carbon-based composite iron cyanamide material and preparation method thereof, and sodium ion battery adopting carbon-based composite iron cyanamide material as negative electrode material
  • Carbon-based composite iron cyanamide material and preparation method thereof, and sodium ion battery adopting carbon-based composite iron cyanamide material as negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The carbon-based composite iron cyanamide material is prepared by the following steps:

[0023] 1) Take 1 g of analytically pure ferricamine oxalate, 2 g of urea, and 0.1 g of CNT according to the mass ratio of 1:2:0.1, and place them in a glass mortar and grind them thoroughly to obtain a fine and uniform light green mixture powder. The product is recorded as A;

[0024] 2) Add 0.02g of EDTA to the product A, dissolve it in water, and disperse it ultrasonically for 10 minutes, then put it into a freeze dryer, and dry it at -50°C for 12 hours to obtain a completely dry black product, which is designated as B;

[0025] 3) Put the product B in a ceramic crucible and in a tube furnace, pyrolyze it under an argon atmosphere, raise the temperature from room temperature to 160°C at a rate of 30°C / min, keep it for 1h, and then continue to heat it at 5°C The heating rate of / min continues to rise to 400 ° C, and the obtained product is a carbon-based composite iron cyanamide m...

Embodiment 2

[0028] Prepare carbon-based composite ferric cyanamide material according to the following steps:

[0029] 1) Take 1.5g of analytically pure ferricamine oxalate, 3g of urea, and 0.45g of graphene respectively according to the mass ratio of 1:2:0.3, and place them in a glass mortar for full grinding to obtain a fine and uniform light green mixture powder, the product mark it as A;

[0030] 2) Add 0.045g of ethanolamine to product A, dissolve it in water, disperse it ultrasonically for 30min, put it into a freeze dryer, and dry it at -50°C for 16h to obtain a completely dry black product, which is marked as B;

[0031] 3) Put the product B in a ceramic crucible and in a tube furnace, pyrolyze it under an argon atmosphere, raise the temperature from room temperature to 160°C at a rate of 30°C / min, keep it warm for 1h, and then continue to heat it at 6°C The heating rate of / min continues to rise to 600 ° C, and the obtained product is a carbon-based composite iron cyanamide mate...

Embodiment 3

[0034] Prepare carbon-based composite ferric cyanamide material according to the following steps:

[0035] 1) Take 2g of analytically pure ferricamine oxalate, 4g of urea and 0.12g of super-p respectively according to the mass ratio of 1:2:0.6, put them in a glass mortar and grind them thoroughly to obtain a fine and uniform light green mixture powder, The product is marked as A;

[0036] 2) Add 0.08g of oleic acid to product A, dissolve it in water, disperse it ultrasonically for 60min, put it into a freeze dryer, and dry it at -50°C for 18h to obtain a completely dried black product, which is marked as B;

[0037] 3) Put the product B in a ceramic crucible and put them together in a tube furnace, pyrolyze it under an argon atmosphere, raise the temperature from room temperature to 160°C at a rate of 30°C / min, and keep it warm for 1h, and then continue to heat it up for 8 The heating rate of °C / min continues to rise to 600 °C, and the obtained product is a carbon-based compo...

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Abstract

The invention discloses a preparation method of a carbon-based composite iron cyanamide material, which comprises the following steps: firstly, respectively taking ferramine oxalate, urea and conductive carbon according to a mass ratio of 1:2:(0.1-1), fully grinding and mixing to obtain uniform mixture powder, and marking the product as A; adding a surfactant into the product A, dissolving in water, dispersing, and freeze-drying to obtain a black product marked as B; and pyrolyzing the product B in a protective atmosphere to obtain a product C, namely the carbon-based composite iron cyanamidematerial. The obtained carbon-based composite iron cyanamide material is taken as a negative electrode material of the sodium ion battery. According to the invention, FeCN2 and conductive carbon are compounded by adopting a high-temperature pyrolysis and nitridation method; the synthetic product carbon-coated iron cyanamide active material is used as a negative electrode material of a sodium ion battery, a new material system is constructed by adding a conductive carbon material, the conductivity of the material is enhanced, and the preparation method is simple to operate, low in cost, safe and non-toxic, and is expected to realize industrial production.

Description

technical field [0001] The invention belongs to the technical field of electrochemical materials, and in particular relates to a carbon-based composite ferric cyanamide material and a preparation method thereof, and also relates to a sodium ion battery using the material. Background technique [0002] In recent years, due to the increasingly urgent demand for large-scale energy storage technology for the utilization of renewable energy, sodium-ion batteries with cheap resources have attracted extensive attention from the scientific and industrial circles. However, due to the large size of sodium ions (DNa+=0.106nm, DLi+=0.076nm), it is difficult to directly embed into the electrode materials of many sodium-ion batteries to realize the electrochemical sodium storage process, which greatly limits the application prospects of such batteries. . Therefore, how to take into account the charge-discharge rate and sodium storage capacity of electrode materials for sodium-ion batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCY02E60/10
Inventor 李嘉胤王蓉郭鹏辉石梁孟云王润宁罗晓敏黄剑锋
Owner SHAANXI UNIV OF SCI & TECH
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